Grinding tool



June 15, 1948.

P. WEYNAND GRINDING TOOL 2 Sheets-Sheet 1 Filed May 6, 1946 FIG. 1.

INVENi'O. p aul WEB 11 an a ATTORNEYS.

June 15, 1948.

P. WEYNAND GRINDING TOOL 2 Sheets-Sheet 2 Filed May 6, 1946 FIG. 9.

FIG. 10.

INVENTOR.

Pap]. WEB narufl BY I 2 7 w ATTORNE s.

Patented June 15, 1948 UNITED STATES PATENT OFFICE 2,443,489 v GRINDING TOOL Paul Weynand, San Antonio, Tex.

Application May 6, 1946, Serial N0. 667,586

This invention relates to grinding tools and more particularly to such tools particularly well adapted to grind annular valve seats of internal f combustion engines having associated with the seats, elements known as valve guides, the axis of which are concentric to the annular valve seats.

The principal object of the invention is to provide such a grinding tool which will have long life,

so to speak, permit the grinding operation to be completed in a minimum period of time and enable the workman to accomplish accurate refacing of the valve seat without exercising great care I in applying the tool to the work. This is in part accomplished by delivering a cooling fluid under pressure directly to the working face of the grind-- .ingstone and directly to the outer periphery of a pilot shaft, associated with the stone and extending into the valve guide. This cooling fluid, such as water or oil, also serves to wash away grindings and take up clearance between the pilot shaft and valve guide.

Another object of the invention is to provide a grinding tool so constructed and arranged that the fluid for cooling, etc., may be introduced into the tool at a point remote from the pilot, such as adjacent the power drive, since it is at times difficult or impossible to lead the fluid supply conduit to a point adjacent thevalve guide.

Other objects and advantages of the invention will appear in the following detailed description of two forms of tools whereby these objects may be accomplished, taken in connection with the accompanying drawings, forming a part of this specification and in which drawings:

Fig. 1 is a view partly in elevation and partly in section of a grinding tool constructed according to the present invention.

Figs. 2 and 3 are cross sectional views on the lines 2-2 and 3-3 of Fig. 1, looking in the direction of the arrows.

with the bushing shown in Fig. 6, secured there- Fig. Sis a view partly in elevation and partly in vertical section of the coupling element shown in Fig. 4.

Fig. 9 is a similar view showing modified form of coupling elements.

Fig. 10 is a similar view showing a modified form of tool part in which several elements shown 7 Claims. (Cl. 51-241) separable in Fig. 1, are integral in this modification.

In the drawings is shown an annular valve seat I I provided with a beveled seating face I2, a boss I3, and a valve stem guide I4, having a cylindrical bore I5, of types common to internal co1nbustion engines, adjacent the cylinders thereof.

The present invention is adapted for grinding the face I2 and using the guide I4 to facilitate accurate grinding. Broadly it is common in the art to do this.

The grinding tool comprises a drive shaft I6, carried by and projecting from a housing ll of any suitable type of power device; a distributor I8 for fluid, such as oil or water, carried by the housing and surrounding the projecting end portion of shaft It; a flexible coupling I9 detachably connected to shaft I6; a grinding wheel 20 detaohably connected to the coupling I9 and a pilot shaft ZI associated with the wheel 20 and coupling I 9.

As suitable means for detachably connecting the shaft I6 to the coupling I9 the former is shown provided with a reduced screw thread end portion 22, and the shaft has an axial way 23, and a lateral way 24 for the fluid, the latter being open to; the circumferential periphery of the shaft adjacent the housing I1.

" The distributor I8 comprises a body part 25 and a flange 26 receiving the shanks of screws 1 in threaded engagement with the housing I'l, whereby the distributor may be detachably connected to the housing. The body part 25 embraces the shaft I6, is provided with an annular groove 28 open to the way 24 of shaft I6 and a screw threaded inletsocket 29 for detachably receiving a fitting 30 such as an elbow which may be connected to a flexible conduit for the fluid, not shown in the drawings. Suitable packingrings 3| are shown above and below the groove 28 to prevent escape of the fluid along the exterior of shaft I6. As noted hereinafter, if it is desired to introduce the fluid into the tool at theend of pilot shaft it is "obvious that any suitable plug, not shown in the drawing may replace the fitting 30 in socket 29.

Referring now to the flexible coupling I9 it preferably comprises a hub 32, a cup-like companion part 33 for the hub spaced therefrom by a body 34 of yieldable material, such as rubber. It is also preferred to provide a boot 35 in the form of an inverted cup held in place on the coupling parts by a split spring ring 36, this boot having for its purpose to exclude grindings or foreign matter from the parts of the cou- 3 pling and to aid in preventing escape of the fluid conducted thru the coupling. The hub, best shown in Fig. 6 is preferably formed at its upper portion with wrench receiving faces 31, a groove 38 therebelow for the ring 36, and a major polygonal portion 39 having vertical grooves 40 for cooperation with the yieldable material 34 to impart rotation of the hub to the latter. The hub also has a screw threaded socket 4| for the reception of the threaded end portion 22 of shaft l6, and an axial way 42 for the fluid, in communication with the way 23 of the shaft. The part 33 of the coupling, best shown in detail in Fig. 8, comprises a base 43 and an upstanding annular wall 44, providing a polygonal socket 45 for the reception of the body 34. The upper portion of wall 44 is preferably rounded or beveled, as at 46 to facilitate insertion of the body 34 into the socket, and slipping of the boot into place with its annular wall 41in intimate contact with theiexternal periphery of ,wall 44. The base 43 is preferably provided with an inverted conical socket 43 open to the socket 45; a short thru axial way 5E9 for fluid; a plurality of lateral ways 5| communicating with way and an annular way 52 in the bottom face of the coupling part 33, as shown in Fig. 4; and a screw threaded socket 54 open to said face for the reception of a portion of the pilot shaft 2| as shown in Fig. 1. Suitable small recesses 55 may be provided in the wall 44, open at diametrically opposite portions thereof, for receiving the lugs or jaws of a spanner wrench, not shown in the drawings. The body 34 may be made of any suitable material such as rubber and is generally of cup-like formation and sufficiently tough that it will readily transmit rotary movement from the hub 32 to the companion part 33 and yet yieldable enough to permit the hub 32, the shaft I6 and associated parts to take an angular position with respect to the axis of part 33 so that a workman is not required to accurately center the power drive with respect to the axis of the pilot shaft 2|. The body 34 is polygonal in cross section as shown in Figs. 3 and 7 to present faces 56 which engage with intimate contact, the walls of socket d5, it being understood that the body 3:! is dimensioned so as to require a forced fit into socket 45. The body 34 is bonded to the hub in any suitable manner, preferably by knurling 51 on the surface of the polygonal portion 39 between the grooves Ml of the hub and vulcanizing the resilient material while in place on the hub so that some of the material is formed with ribs 58 extending into the grooves 40. Extending from the central portion of the bottom of body 3 5, and integral therewith, is an inverted conical projection 59 adapted to fit tightly in the conical socket id of part 33 of the coupling as shown in Fig. 1. The body 34 is also provided withan axial way Ell communicating with the ways 42 and 5d of parts 32 and 33, respectively when the coupling is assembled.

The grinding wheel 2c is, in general, similar to those provided for valve seat grinding in that it includes an internally threaded hub or bushing .62 and annular body .63 of abrasive material bonded to the hub, and having a working face-$4,

I in the example shown, beveled to conform to the The wheel differs from I packing disc 51 is securedtoithexface ififirbyran- 4 adhesive 38, perforated as at 69 so as to not ob-- struct passage of fluid to the ways from the annular way 52 with which they communicate;

In the example shown in Figs. 1-8, the pilot shaft 2| is detachable from the coupling l0 and serves to secure the wheel 20 thereto. It com-'- prises a shank or shaft proper I l, and an integral screw threaded head 12, there being a tapered portion 13 between the shaft and head, which is shown as notched at 14 for the reception of the lugs of a spanner wrench, not shown in the drawing. The lower end of the shank or shaft is also tapered as at 14. These tapers may be at the same angle to the axis of the shaft and are useful in'refacing the grinding wheel. The pilot shaft has an axial way 15 for communication with the ways 5|] and5l of the coupling part 33, also lateral ways 16 communicating with way 15 and open to the periphery of shank H, as shown in Fig. l. The ways 16 preferably extend outwardly and upwardly from way 15 so as to direct the fluid upwardly or against the force of gravity, so as to cool the valve stem guide [4 thruout its length and effectively take up clearance between the pilot shaft and valve stem guide, as well as act as a lubricant. The lower end of the way 15 may be closed by a screw threaded plug 11, which may be removed, if it is desired to introduce fluid into the lower portion of the pilot-shaft as by connecting a hose, not shown in the drawing, to the lower end of the valve stem guide M.

In Fig. 9 is shown a modified form of hub 18 and body 19 of yieldable material in which the boot is formed integral with the body 19 and while the hub 18 has wrench faces 8|, this form dispenses with the groove 38 shown in Fig. 6. Otherwise the units may have the same characteristics as those shown in Figs. 1, 3, 6 and '7.

In Fig. 10 is shown a form of the invention where the pilot shaft 82 is integral with the part 83 of the coupling corresponding to part 33 thus dispensing with the threaded engagement of a pilotshaft head with the coupling. In this modifled form, the pilot shaft head 84 has external screw threads 85 to receive the hub 62 of the grinding wheel 28. Otherwise the coupling part and pilot shaft may have the same characteristics as the parts shown in Figs. 1 and 8.

It is believed that the operation of these forms of grinding tools is clear from the foregoing, however, it is pointed out that the construction and arrangement of parts provides means for introducing fluid under pressure at the working faces of the grinding wheel and pilot shaft where a cooling medium is very desirable, the fluid also acting as a lubricant and carrying away grindings in a manner that they are not likely to reach .parts subject to undesirable wear.

While the embodiments of the present invention as herein disclosed, constitute a preferred and a modified form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

I claim:

1. A grinding tool comprising, a rotary drive shaft, a grinding wheel driven by said shaft, and a pilot shaft coaxial with said grinding wheel, said shafts provided with longitudinal ways in communication with each other for conducting fluid, and said wheel and pilot shaft provided with lateral ways in communication with said shaft ways for conductingfluid therefrom, said lateral ways open to the working faces of said wheel andpilot shaft. I I

2. A grinding tool comprising, a rotary drive shaft, a grinding Wheel, .a flexible joint constructed and arranged to impart rotation of said shaft to the Wheel, and a pilot shaft coaxial with said grinding wheel, said shafts and joint provided with longitudinal ways in communication with each other for conducting fluid and said wheel and pilot shaft provided with lateral ways in communication with said longitudinal ways for conducting fluid therefrom, said lateral ways open to the working faces of the wheel and pilot shaft.

3. A grinding tool comprising, a rotary drive shaft, a grinding wheel, a flexible joint constructed and arranged to impart rotation of said shaft to the wheel, and a pilot shaft coaxial with said grinding wheel, said shaft and joint provided with ways in communication with each other for conducting fluid, said pilot shaft provided with a. longitudinal way for conducting fluid, said grinding wheel provided with lateral ways for conducting fluid from said first mentioned ways to the working face of the wheel, and said pilot shaft provided with lateral ways for conducting fluid from the said longitudinal way thereof to the working face of the pilot shaft.

4. A grinding tool for annular valve seats having associated therewith a sleeve like valve stem guide coaxial with the seat, comprising, a housing and a drive shaft carried by and projecting from said housing, said shaft provided with a first axial way for fluid and a second lateral way for fluid in communication therewith, open to the peripheral face of the shaft at its portion projecting from said housing, a flexible coupling connected at its one end to the projecting end of said shaft and provided with a third axial way for fluid in communication with said first way and fourth lateral ways in communication with said third way, a grinding wheel connected to the other end of said flexible coupling and provided with fifth ways in communication with said 'fourth ways, said fifth ways open to the working face of the grinding wheel, and a pilot shaft coaxial with said grinding wheel, said pilot shaft provided with a sixth way for fluid in communication with said third way and seventh ways in communication with said sixth ways, the latter being open to the periphery of the pilot shaft.

5. In a grinding tool, the combination of a housing and .a drive shaft carried by and projecting from said housing, said shaft provided with a first axial way for fluid and a second lateral way for fluid in communication therewith, open 5',

ment of the former to the latter, said hub, yieldable material and companion part provided with ways for fluid in communication with said first way and open at a face of said companion part of the coupling; and a grinding wheel carried by said companion part of the coupling and provided with ways for fluid open at the working face of the wheel and communicating with said ways of the flexible coupling.

6. In a grinding tool, the combination of a housing and a drive shaft carried by and projecting from said housing, said shaft provided with a first axial way for fluid and a second lateral way for fluid in communication therewith, open to the circumferential face of the shaft at its portion adjacent to and projecting from the casing; a distributor rigid with said casing, embracing said shaft and provided with an annular groove open to said second way and a lateral intake way for fluid, in communication with said annular groove; a flexible coupling, comprising a hub detachably connected to said drive shaft, a companion part for the hub spaced therefrom, and yieldable material in coupling relation to said hub and companion part to impart movement of the former to the latter, said hub, a body of yieldable material and companion part provided with ways for flu'id in communication with said first way and open at a face of said companion part of the coupling; a grinding wheel provided with ways for fluid open at the working face of the wheel and communicating with said ways of the flexible coupling; and means detachably connecting said grinding Wheel to said companion part of the coupling.

7. A grinding tool for annular valve seats comprising, a housing, a drive shaft carried by and projecting from said housing, said shaft provided with @a first axial way open at the projecting end thereof for conducting fluid, a flexible drive coupling comprising a first part rigidly connected to and rotatable with said shaft, and a second part carried by said first part and constructed and arranged to rotate therewith either coaxial with the shaft or with the axis of the second part in slight angular relation with the shaft, said coupling provided with a second axial way for fluid in communication with said first way, and third lateral ways for fluid in said second coupling part, in communication with said second way; and a grinding wheel connected to said second coupling part and provided with fourth Ways in communication with said third ways, and also open to the working face of the grinding wheel.

PAUL WEYNAND.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 436,892 Harrington Sept. 23, 1890 524,572 Beckert Aug. 14, 1894 2,089,040 Shue Aug. 3, 1937 

